Extract all video frame from mp4 video using OpenCV and C++ - c++

Question

I'm following a tutorial to extract video frames. I've read this question, it doesn't work, also queationfrom Open CV Answer, but the solution is for capturing current frame. I have a 120fps video and want to extract all of them. Here's my code
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <iostream>
#include <string>
#include <sstream>
using namespace cv;
using namespace std;
int c = 0;
string int2str(int &);
int main(int argc, char **argv) {
string s;
VideoCapture cap("test.mp4"); // video
if (!cap.isOpened())
{
cout << "Cannot open the video file" << endl;
return -1;
}
double fps = cap.get(CV_CAP_PROP_FPS); //get the frames per seconds of the video
cout << "Frame per seconds : " << fps << endl;
namedWindow("MyVideo", CV_WINDOW_AUTOSIZE); //create a window called "MyVideo"
while (1)
{
Mat frame;
Mat Gray_frame;
bool bSuccess = cap.read(frame); // read a new frame from video
if (!bSuccess)
{
cout << "Cannot read the frame from video file" << endl;
break;
}
s = int2str(c);
//cout<<("%d\n",frame )<<endl;
c++;
imshow("MyVideo", frame); //show the frame in "MyVideo" window
imwrite("ig" + s + ".jpg", frame);
if (waitKey(30) == 27) //esc key
{
cout << "esc key is pressed by user" << endl;
break;
}
}
return 0;
}
//int to string function
string int2str(int &i) {
string s;
stringstream ss(s);
ss << i;
return ss.str();
}
My problem is, I have a minute video at 120fps. I expected to be able to extract 120 frames. But the extraction went wrong, the video last for 1 minute but I got more than 200 frames stored in my folder. Did I do something wrong in my code ?